feat: overlay layers

etc/boot.lua

@@ -36,7 +36,7 @@ function lovr.boot()
       stencil = false,
       antialias = true,
       submitdepth = true,
-      overlay = false
+      overlay = 0
     },
     math = {
       globals = true

src/api/l_headset.c

@@ -646,7 +646,7 @@ int luaopen_lovr_headset(lua_State* L) {
     .stencil = false,
     .antialias = true,
     .submitDepth = true,
-    .overlay = false
+    .overlay = 0
   };
 
   luax_pushconf(L);
@@ -688,7 +688,7 @@ int luaopen_lovr_headset(lua_State* L) {
       lua_pop(L, 1);
 
       lua_getfield(L, -1, "overlay");
-      config.overlay = lua_toboolean(L, -1);
+      config.overlay = lua_tointeger(L, -1);
       lua_pop(L, 1);
     }
     lua_pop(L, 1);

src/modules/headset/headset.h

@@ -25,7 +25,7 @@ typedef struct {
   bool stencil;
   bool antialias;
   bool submitDepth;
-  bool overlay;
+  int overlay;
 } HeadsetConfig;
 
 typedef enum {

src/modules/headset/headset_openxr.c

@@ -178,7 +178,7 @@ static struct {
     bool handTrackingMesh;
     bool headless;
     bool keyboardTracking;
-    bool overlay;
+    int overlay;
     bool refreshRate;
     bool viveTrackers;
   } features;
@@ -912,10 +912,11 @@ static void openxr_start(void) {
 #ifdef XR_EXTX_overlay
     XrSessionCreateInfoOverlayEXTX overlayInfo = {
       .type = XR_TYPE_SESSION_CREATE_INFO_OVERLAY_EXTX,
-      .next = info.next
+      .next = info.next,
+      .sessionLayersPlacement = state.features.overlay
     };
 
-    if (state.features.overlay) {
+    if (state.features.overlay > 0) {
       info.next = &overlayInfo;
     }
 #endif
@@ -1079,7 +1080,7 @@ static void openxr_start(void) {
 
     XrCompositionLayerFlags layerFlags = 0;
 
-    if (state.features.overlay) {
+    if (state.features.overlay > 0) {
       layerFlags = XR_COMPOSITION_LAYER_BLEND_TEXTURE_SOURCE_ALPHA_BIT | XR_COMPOSITION_LAYER_UNPREMULTIPLIED_ALPHA_BIT;
     }
 

src/modules/headset/headset_webxr.c

@@ -1,6 +1,6 @@
 #include "headset/headset.h"
 
-extern bool webxr_init(float supersample, float offset, uint32_t msaa, bool overlay);
+extern bool webxr_init(float supersample, float offset, uint32_t msaa, int overlay);
 extern void webxr_start(void);
 extern void webxr_destroy(void);
 extern bool webxr_getName(char* name, size_t length);